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During her formative years, Number One was raised in the Illyrian colonies alongside her brothers, Hudek and Leighton. With her given Illyrian birthname considered to be all but impossible for outsiders to pronounce, she adopted the name "Una" (signifying the concept of "one") at least as far back as her Starfleet Academy days, always having been first in her class regarding academics, athletics, intellect, and accomplishments, subsequently being dubbed "Number One" as a variation on this by her classmates. (TOSnovel: The Children of Kings, TOS - Legaciesnovel: Captain to Captain)

In October2249, a routine followup survey expedition to the Librosstar system by the Enterprise discovered an extradimensional incursion by a hostile alien species (the Jatohr) who had enslaved the indigenous population of planet Libros III (called "Usilde" in the native tongue). A disastrous landing party expedition commanded by Una resulted in the entire party (except for Robbins/Una) being sent into a parallel universe with little hope of rescue, although the Ptaen incursion was repulsed and the sluglike aliens likewise exiled back to their native reality. However, a piece of technology known as the Transfer Key was recovered by Captain April, and Una resolved to eventually rescue her comrades, despite potentially taking decades to do so. (TOS - Legaciesnovel: Captain to Captain)

According to Vulcan's Glory, the two had served together for four years as of 2254. The short story "Chaotic Response" suggests that she did not become first officer until sometime after 2252, before which time she was called "Number Five".

In 2254, following an attack by a mysterious alien race, the Ngultor, Number One led a landing party to rescue Captain Pike from Ngultor captivity (EVcomic: "Flesh of My Flesh"). On the Enterprise's next mission, in the Marrat Nebula, Number One led another landing party, this time to investigate a loss in communications at Starfleet's Project Pharos. Shortly after beaming down, the party came under attack from Klingons, Number One used the transporters to beam in behind the Klingon attackers and neutralize them before rescuing a team of Starfleet engineers the Klingons had been holding captive. (EVcomic: "The Fires of Pharos")

Following a disastrous visit to Rigel VII, Number One and the Enterprise found themselves visiting the mysterious planet Talos IV where Captain Pike was taken captive by the native Talosians. Determined to rescue the Captain, Number One once again led a rescue party. Unfortunately the Talosians were able to manipulate the Enterprise's transporters delivering only Number One and Yeoman Colt into the Talosian habitat. The entire party later escaped. (TOSepisode: "The Cage") Very shortly following the Talos IV incident, the Enterprise was sent to a rift that opened every 33 years into the Gamma Quadrant of the galaxy. The starship received brand-new, highly-advanced computer voice modules, with her own voice-patterns subsequently imprinted upon the Enterprise's computer, which lead to her voice being used in future years. (TOSnovel: The Rift)

Not long after, Pike left Number One in command of the Enterprise while he led a landing party to Darien 224. She was forced to take the starship into battle when they were attacked by the USS Cortez, which had been commandeered by a group of hostile Vulcans. The Enterprise stopped at Deep Space Station K-12 to receive repairs following the incident, and Number One was left in charge again when Pike left for Earth after hearing his father was ill. However, it soon became apparent that the message had been faked; unfortunately, the message was too degraded to track it to its point of origin. Fortunately, someone sent a screened untraceable message to the Enterprise informing them of Pike's location, and Number One was able to take the Enterprise to rescue him from his Klingon adversaries who had set the trap. (EVcomics: "Cloak and Dagger", "The Flat, Gold Forever")

In 2255, the Enterprise crew became stricken with Rigelian fever, with Captain Pike ordering the starship to Cypria III, location of the rare substance ryetalyn, the only known curative. However, en route, the ship intervened in a pursuit involving the adopted Cyprian daughter of a Klingon general, which threatened to bring down a sizeable military response against both the Enterprise and Cypria III. Planetside, Number One was forced into action to rescue her landing party from a hostile population riled up by opportunistic politicians against them, resulting in a diplomatic incident. However, Number One succeeded in saving her crewmembers and returning to the Enterprise, and both the Rigelian fever and the Klingon situation were soon resolved. (TOSnovel: Child of Two Worlds)

By 2264, Number One still served aboard the Enterprise under Pike. Following Pike's decision to accept promotion to the rank of fleet captain and reassignment, Number One agreed to remain behind and continue as first officer under James T. Kirk. Unfortunately, days before the change-of-command ceremony, Number One had an accident in the ship's cargo hold, where a cargo container fell onto her and crushed both her legs. Thankfully, she received prompt medical treatment from Dr. Phillip Boyce, but her long recovery meant that she couldn't serve as Kirk's first officer. (TOScomic: "All Those Years Ago...")

Number One was given command of the USS Yorktown at some point prior to the year 2267. In that same year, following the return of Captain Kirk and his crew from the Mirror universe, Robbins/Una finally discovered the means to reactivate the Transfer Key device (from the ill-fated Usildar mission of 2249) and rescue her former Enterprise crewmates from a hellish alternate universe.

However, this was attempted by Una stealing the Key from Kirk's quarters under the pretense of a friendly ship-visit — Number One fleeing the starship aboard a high-speed courier vessel; the Enterprise pursuing her back to the Librosian star system, now claimed by the Klingon Empire. Planetside, Robbins/Una escaped from hostile native clutches, only to be saved by Kirk and Spock when attempting to enter the abandoned Jatohr citadel there. With Klingons closing in, Number One used the Transfer Key to enter the home dimension of the Jatohr in an attempt to bring her missing crewmates home; Kirk and Spock barely escaping back to the Enterprise in the nick of time. (TOS - Legaciesnovel: Captain to Captain)

Upon arriving in the alternate universe, Una journeyed across a massive, burning desert where she ultimately encountered her stranded crewmates from decades earlier. However, in order to attempt an escape from the dimension, an expedition to the Jatohr capital city was necessary to prevent the slug-like aliens from interdicting the Enterprise's extraction-efforts in two months' time, and this resulted in the capture and interrogation of Una, Tim Shimizu, and Lieutenant CommanderRaul Martinez by the Jatohr leadership. (TOS - Legaciesnovel: Best Defense)

At some point after these events, Number One was eventually promoted to the rank of commodore, and resumed command of the USS Yorktown, when, in 2270, she was sent by Starfleet Command to the Romulan Neutral Zone using a cloaking device, under orders to engage the Romulans. While in the Neutral Zone, her ship had power trouble with the cloaking device, and came under attack from Captain Koloth's ship. During the engagement, Number One and the Yorktown successfully disabled the enemy vessel.

The Yorktown was then confronted by a RomulanWarbird. Luckily, she was able to escape by using a plasma field. However, the Yorktown came under fire from a Klingon-Romulan fleet under Romulan PraetorGaius and Capt. Koloth. Number One, along with members of her bridge crew and Koloth and his bridge crew, were beamed aboard Gaius' ship. On board the Keras, Number One and one of her officers were brutally interrogated by the praetor for information on Capt. James T. Kirk and the USS Enterprise. She was then transported aboard the USS Constitution, of which she then took command. She encountered the OrganianAyelborne, who forced the Romulans to abide by the terms of the Organian Peace Treaty. (TOScomic: "Romulans: Schism")

In Greg Cox' TOS Legacies novel Captain to Captain, Number One/Una is already in command of the USS Yorktown, which clashes slightly with the implication in John Byrne's various comics that she took command of the starship only after her promotion to the flag rank of commodore. Possibly she held command of the Yorktown up through 2267, only to temporarily lose it after her expedition to the Jatohr universe, followed by her regaining command in 2270. It is actually mentioned in the Cox novel that her promotion to commodore was seemingly imminent, possibly delayed for some years due to her seeming insubordination in that storyline.

She harbored fantasies for Pike for some time, and these were exposed to him by the Talosians in 2254. (TOScomic: "The Cage")

Normally, however, Number One was strictly logical, masking her emotions. One area of obsession for her was computers. In 2254, she assisted Lieutenant Spock in installing upgrades to the computer that made it voice-interactive. Her voice was used as a base pattern, something which later carried over to all Starfleet computers well into the late 24th century. (TOSnovel: The Rift)

Morgan Primus was revealed as the mother of Robin Lefler in New Frontier. Jerry Oltion's stories, Where Sea Meets Sky and "Conflicting Natures," although set in a much earlier timeframe, identify Number One as using the surname "Lefler" in reference to the New Frontier series, although his stories predate the relationship with Robin Lefler's father, Charles.

According to the Star Trek: Early Voyages comics, her last name is "Robbins." In the first issue Pike starts to say her first name once, but is interrupted, getting as far as "Eure--."

Conflictingly, in the TOS 50th Anniversary Legacies novel Captain to Captain, Number One's Illyrian birth name is considered to be impossible for outsiders to pronounce, hence her choosing the easier name of "Una" (signifying the concept of "one") during her Starfleet Academy years, followed by her classmates dubbing her "Number One," due to her top-ranking performances in all intellectual and athletic areas at the Academy.

In the short storyChaotic Response, the character used the name to constantly remind herself how far she had to go in the chain of command, having come on board the Enterprise using the name "Number Five." However, as this part of the story was a part of Spock's dream sequence, it may not actually be applicable to the character at all.

In the John Byrne Assignment: Earth comic mini-series, there is a woman called Diana Winters, who works as agent "Number One" to forces unknown, and she looks similar to our Number One.